Fix deprecated on tree builder root (#70)

* Fix deprecated on tree builder root

* Require symfony/config ^4.2

* fix(deps): drop support for symfony 3.4

Co-authored-by: Oliver THEBAULT <Oliboy50@users.noreply.github.com>

Author: maximecolin

composer.json

@@ -18,19 +18,19 @@
     },
     "require": {
         "php": "^7.1.3",
+        "symfony/config": "^4.4 || ^5.0",
+        "symfony/dependency-injection": "^4.4 || ^5.0",
+        "symfony/event-dispatcher-contracts": "^1.1 || ^2.1",
+        "symfony/http-kernel": "^4.4 || ^5.0",
         "symfony/property-access": "^4.4 || ^5.0",
         "m6web/statsd": "^1.3"
     },
     "require-dev": {
-        "atoum/atoum": "^2.8|^3.0",
+        "atoum/atoum": "^2.8 || ^3.0",
         "m6web/coke": "~1.2",
         "m6web/symfony2-coding-standard": "~1.2",
-        "symfony/config": "^4.4 || ^5.0",
         "symfony/console": "^4.4 || ^5.0",
-        "symfony/dependency-injection": "^4.4 || ^5.0",
-        "symfony/event-dispatcher-contracts": "^1.1 || ^2.1",
-        "symfony/http-foundation": "^4.4 || ^5.0",
-        "symfony/http-kernel": "^4.4 || ^5.0"
+        "symfony/http-foundation": "^4.4 || ^5.0"
     },
     "autoload": {
         "psr-4": {

src/DependencyInjection/Configuration.php

@@ -18,14 +18,8 @@ class Configuration implements ConfigurationInterface
      */
     public function getConfigTreeBuilder()
     {
-        // symfony/config >= 4.2.0
-        if (\method_exists(TreeBuilder::class, 'getRootNode')) {
-            $treeBuilder = new TreeBuilder('m6_statsd');
-            $rootNode = $treeBuilder->getRootNode();
-        } else {
-            $treeBuilder = new TreeBuilder();
-            $rootNode = $treeBuilder->root('m6_statsd');
-        }
+        $treeBuilder = new TreeBuilder('m6_statsd');
+        $rootNode = $treeBuilder->getRootNode();
 
         $this->addServersSection($rootNode);
         $this->addClientsSection($rootNode);